161103356431 has 2 divisors, whose sum is σ = 161103356432. Its totient is φ = 161103356430.

The previous prime is 161103356387. The next prime is 161103356441. The reversal of 161103356431 is 134653301161.

It is a strong prime.

It is an emirp because it is prime and its reverse (134653301161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161103356431 - 2¹¹ = 161103354383 is a prime.

It is a super-2 number, since 2×161103356431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161103356441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80551678215 + 80551678216.

It is an arithmetic number, because the mean of its divisors is an integer number (80551678216).

Almost surely, 2^161103356431 is an apocalyptic number.

161103356431 is a deficient number, since it is larger than the sum of its proper divisors (1).

161103356431 is an equidigital number, since it uses as much as digits as its factorization.

161103356431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

Adding to 161103356431 its reverse (134653301161), we get a palindrome (295756657592).

The spelling of 161103356431 in words is "one hundred sixty-one billion, one hundred three million, three hundred fifty-six thousand, four hundred thirty-one".